Titlebook: British Stratigraphy; F. A. Middlemiss Book 1974 George Allen & Unwin Ltd 1974 Cambrian.Carboniferous.Cretaceous.Deltas.Devonian.Jurassic.

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interlude

Tertiary Cycles of Sedimentation and Igneous Activity,urs) and several other characteristic Cretaceous groups of animals were quite suddenly extinguished at the end of the Cretaceous. On the land the dinosaurs died out and left the field free for the rapid expansion of the mammals in the Tertiary. There was also a big change in plant life, the true flo

深陷

Entscheidungen der Preispolitik,urs) and several other characteristic Cretaceous groups of animals were quite suddenly extinguished at the end of the Cretaceous. On the land the dinosaurs died out and left the field free for the rapid expansion of the mammals in the Tertiary. There was also a big change in plant life, the true flo

PLE

The Pre-Cambrian Era, to correlate them. A few interesting fossils have been found in the younger Pre-Cambrian rocks, but it remains generally true to say that there are none of stratigraphical value. Isotopic dating is therefore of great value and most correlation of Pre-Cambrian rocks is based upon it, especially as t

強(qiáng)制性

The Lower Palaeozoic Geosyncline,folding movements, into a folded-mountain chain. A geosyncline (Fig. 5) can be defined as an elongated downwarping of the crust of the earth, forming a deep trough in which a great thickness of sediments accumulates. This definition needs to be somewhat enlarged. First the downwarp is occupied by th

Communicate

The Caledonian Mountain-building,he Lower Palaeozoic era (Fig. 7), these movements being named the Caledonian Orogenesis; one can hence speak of Caledonian structures having been imposed on the rocks and of the Caledonian mountains having been produced. As mentioned above, there were several periods of folding of the geosyncline du

Increment

高爾夫

The Upper Carboniferous Deltas and Coal Swamps,and with lavas, described above, continued uninterruptedly into the Upper Carboniferous. Further south, as now seen in the southern Pennines, North and South Wales, conditions changed at this time and another series of great deltas began to be built outwards from the neighbouring land areas. These d

得罪人

Jejune

The Permo-Triassic Desert Environment,aeozoic era and the Triassic as the first of the Mesozoic era because of a considerable difference in the fossil faunas seen where these periods are represented by fully marine strata ; the Permian fauna is broadly reminiscent of the Car-boniferous, while the Triassic fauna is in many respects a for